Reading Japanese query parameters from the URL

Question

I am getting query parameter as "ã\\u0083\\u008eã\\u0083¼ã\\u0083\\u0096ã\\u0083©ã\\u0083³ã\\u0083\\u0089å\\u0093\\u0081" in my controller for Japanese character "ノーブランド品".

Is there a way to translate all query parameters into UTF-8? I have tried multiple solutions but it does not seem to be working Solution I tried

URLDecoder.decode(string, "UTF-8");

Another solution I tried is

 ByteBuffer buffer = StandardCharsets.UTF_8.encode(encodedName);
 decodedName = StandardCharsets.UTF_8.decode(buffer).toString();

Is there a way to decode the string back to Japanese once it is translated? Reason am asking is because page that is calling us is not owned by us

Thanks